GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Avalanche - 4WD 🢒 Engine 🢒 Engine Mechanical - 8.1L 🢒 Water Crossover Cleaning and Inspection

Cleaning Procedure

    Object Number: 635643 Size: SH
  1. Clean the coolant crossover (7) and water outlet (1) in solvent.

    2. Caution: Wear safety glasses in order to avoid eye damage.

  2. Dry the coolant crossover and water outlet with compressed air.

Inspection Procedure

    Object Number: 635643 Size: SH
  1. Inspect the coolant crossover (7) for the following:
    2. • Corrosion or damage to the gasket sealing surfaces (5)
    • Corrosion or damage to the bypass hose fitting (6)
    • Corrosion or damage to the heater hose fitting (8)
    • Corrosion or damage to the threads for the water outlet (4)
  2. Inspect the water outlet (1) for corrosion or damage.
  3. Repair or replace the coolant crossover and/or water outlet as necessary.